- No surprise to see diesel topping this list
- BMW 420d is the best performer, M4 the worst
- Even powerful petrol models boast decent MPG
BMW 4 Series running costs aren’t going to be miserly, but if you need to watch your wallet the 420d is probably the car for you, if you’re doing enough miles to warrant the extra costs associated with choosing diesel over petrol.
The 440i will return 33.6mpg* according to BMW, but if you want a lower-cost petrol 4 Series we’d recommend the 430i – it claims a virtually identical 37.2mpg* to the 420i but is a second and a half quicker from 0-62mph.
Diesel numbers are more impressive – the aforementioned 420d in particular boasts 50.4mpg*. Even the most powerful 435d reckons on 40.4mpg.
All these figures quoted are for automatic-gearbox equipped cars, which promise better economy than their manual counterparts. Conversely, expect a small reduction in efficiency for xDrive equipped models.
BMW M4 Coupe running costs
Bringing up the rear in terms of economy is the M4, offering 28.5mpg* whether you pick the Competition pack or not.
It’s worth noting here that servicing and maintaining an M4 isn’t for the cost-conscious – it’s an incredibly hard-edged performance car and as such it’ll hammer its way through consumables like tyres.
*All fuel economy figures quoted here use the new WLTP test schedule and assume the smallest wheels available – larger alloys, like you’d get on an M Sport version of a 4 Series, will have a negative impact on mpg
Your choice will be affected by the gearbox, as the eight-speed automatic is actually more efficient than the six-speed manual in most cases – knocking off 20g/km in the 440i. If you want xDrive all-wheel drive you can expect a penalty up to 10g/km of CO2. We’ve quoted the lowest possible figures here, adjusted to the most recent WLTP fuel economy and emissions standards.
If keeping BMW 4 Series emissions low is your priority then it’s no surprise you should skip past the petrol cars (particularly the most polluting M4 Competition with 232g/km) and concentrate solely on the diesel. That said the 430i emits a reasonable 140g/km, only 1g/km more than the 420i.
It will be no surprise at all to hear that the best choice is the 420d, with its 124g/km of CO2 - far lower than the more powerful 430d which puts out 144g/km, or 154g/km in xDrive form.
Those figures lead neatly on to the fastest non M-car in the line up, the 435d, which produces 162g/km, considerably better than the faster M4’s 194g/km.
- BMW 4 Series Coupe shares much with the 3 Series Saloon
- Engines and gearboxes used in a wide variety of models
- Durable, well-constructed interior is resistant to wear
We’ve got a decent selection of owners’ reviews of the 4 Series Coupe and the vast majority are four or five stars, indicating this is a BMW you can depend upon. In fact, the only two-star review comes from a buyer who doesn’t like the manual gear change, and that’s fixed simply by picking an automatic transmission, like the overwhelming majority of UK drivers.
Don’t forget that under the skin, the 4 Series is based on the venerable 3 Series – a model that’s been around a long time.
The good news is it therefore shares components, equipment and of course engines and gearboxes from the German manufacturer’s extensive catalogue. We wouldn’t anticipate any catastrophic problems.
Your 4 Series should remain in service without issue. Typically of BMW the interior manages to straddle the fine line between luxury and durability with ease, the switchgear feeling robust and the cabin plastics resistant to marking and minor damage.
Estimated fuel cost per year
|Fuel type||Pence per litre||Estimated cost per year *|
|Unleaded||128p||£1,141 - £1,877 *|
|Diesel||131p||£851 - £1,323 *|
* The estimated fuel cost figure is based on an annual mileage of 10,000 miles and is a guide to how much this model will cost in fuel each year. It's calculated using the model's average MPG (calculated from both town centre and motorway driving) and the average fuel price from around the country. Actual fuel costs will vary based on driving style and road conditions.
Highest and lowest CO2 emissions
|Engine||CO2 emissions||Road tax (12 months)|
|2.0d (190bhp) Diesel||106 g/km (Min)||£20|
|3.0 Petrol||227 g/km (Max)||£325 - £465|
Ongoing running costs
|Road tax (12 months)||
£20 - £465
See tax rates for all versions
24 - 50
How much is it to insure?
Vehicle excise duty (VED) varies according to the CO2 emissions and the fuel type of the vehicle. For cars registered before 01 March 2001 it is based on engine size. For cars registered on or after 01 March 2001 the VED or road tax is based on the car's CO2 emissions.